3D MC simulations of strain, channel orientation, and quantum confinement effects in nanoscale Si SOI FinFETs
© 2016 IEEE. An in-house 3D Finite Element (FE) Monte Carlo (MC) toolbox is used to study the effects of uniaxial tensile strain in nanoscale Si n-channel SOI FinFETs with two channel orientations ((100) and (110)). We simulate a FinFET with a rectangular-like cross-section (4.5 nm × 11 nm) and a gate length of 8.1 nm with EOT=0.55 nm and study the effects of two types of tensile strain: uniaxial (100) and uniaxial (110) with strain strengths of 0.5%, 0.7% and 1.0%. To show how quantum confinement can degrade the effectiveness of strain engineering, we compare the results with a bigger device with a rectangular-like cross section (12 nm × 30 nm) and a gate length of 25 nm with EOT=1.12 nm. It is found that applying the uniaxial (100) strain increases more the on-current than the uniaxial (110) strain. Moreover, with increasing the strain strength, the quantum confinement induced pre-existing valley splitting starts to weaken the strain effect especially in the (110) channel orientation.
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Publication: Congress
1624015048395
June 18, 2021
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© 2016 IEEE. An in-house 3D Finite Element (FE) Monte Carlo (MC) toolbox is used to study the effects of uniaxial tensile strain in nanoscale Si n-channel SOI FinFETs with two channel orientations ((100) and (110)). We simulate a FinFET with a rectangular-like cross-section (4.5 nm × 11 nm) and a gate length of 8.1 nm with EOT=0.55 nm and study the effects of two types of tensile strain: uniaxial (100) and uniaxial (110) with strain strengths of 0.5%, 0.7% and 1.0%. To show how quantum confinement can degrade the effectiveness of strain engineering, we compare the results with a bigger device with a rectangular-like cross section (12 nm × 30 nm) and a gate length of 25 nm with EOT=1.12 nm. It is found that applying the uniaxial (100) strain increases more the on-current than the uniaxial (110) strain. Moreover, with increasing the strain strength, the quantum confinement induced pre-existing valley splitting starts to weaken the strain effect especially in the (110) channel orientation. - Elmessary M., Elmessary M., Nagy D., Aldegunde M., Garcia-Loureiro A., Kalna K. - 10.1109/SISPAD.2016.7605189
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